Tsop Flashing A 1.0 Xbox With Limited Resources, need to mod the 1.0 but im truly lost Options

[poseoff]

Hi, I am hoping someone here can help

I have a unmodded Xbox 1.0 and a modded Xbox 1.6
I want to mod the unmodded xbox to run XBMC, and install a larger hard drive. I do not have a memory card but i do have a copy of 007 Agent Under fire.

What i want to do or plan to do if possible, is flash the TSOP with a modded bios. however i am a little confused.
Ideally i am hoping that by flashing the TSOP, i can run slayers, and install all that's needed to a larger hdd and then have XBMC installed.
however, what i need to understand are what are my options. i cannot move the modchip installed in the 1.6, but i can swap the hdd's if needed to transfer the exploits required. how can i get the TSOP flashing using the tools that i have. with so much information accumulated here, its not so easy to search for definitive answers

Any tips on how to achieve my goal would be great, or links that i can use to piece together a solution
Thanks

J